It has been argued that this is what would happen if a building
fell on top of people. In point of fact, if a skyscraper simply collapsed with
people under the collapsing floors, they would be crushed between floors and
their remains would end up under the rubble pile.

So, how did the 700 bone fragments less than 1cm long end up
on top of the Bankers Trust building? Here is a picture of where the planes
left their debris:

As you can see in the picture, the bones could not have come from the plane
impacts, the planes were going in the opposite direction, and wtc2 is in between
the exit point of flight 11 from wtc1 and Bankers Trust.
So how did the bone fragments get on top of the Bankers Trust building without
the help of explosives when the towers came down? The most probable cause is
that explosives blew them the distance.